Radiofrequency transformer



Juy 27 192%, mmm

M. G. SATERLTIN MDIOFHEQUENCY TRANSFORMER VFiled July 20, 1925 tary coil with respect to the the scope of the su isv employed. The coii 2Q the coil 14.- is of course in series 'Witii the coil 19 of the rotary member so as define, practically, a variometer which ie connected 1n the plate circuit.

In' the operation it will be apparent that in the first step otampiication there ie nc need for any adjustment other that ai:-

orded by the condenser Whereas inu the second stepl there is the condenser adgnstnient Whic simultaneously adgusts the ro stationary coil. I have discovered that this instrument acts in ysuch manner as to be almost entirely free from any magnetic pick-up due tothe eld of a coil placed near it as the voltage induced in one leg of the coil will be balanced by the r Junter-voltage induced. b the same yfield in tne other leg of the coi Similarly, this form of radio frequency transformer will not have voltages induced in it by passing `Waves from radio stations, for the same rea-` son. It is thus possible to build multi-stage radio frequency receivers in which the danger of oscillation is almost entirely eliminated. By var ing the coupling, that is increasing it as t e Wave length is increased, and vice versa, it is possible to ,obtain uniform amplification over 'the .entire wave "lengtlrrange of the receiver. IWhile-a cerjtion and arrangement or' parte as will not depart from the irit of the invention or join'ed claims.

Having thus ciairnzw l. A radio requency transformer comprising a form inc" ling paraliel portons and carrying a continuous coii about both portions, and a eeparate coil located within portion of said coil in inductive relation both.

2. A radio frequency transformer comprising a U-shaped core carrying a continuous coil extending about both legs and the Ytight portion thereof, and a core mounted Within one of the legs oi Said core and carrying a coil.

8. A radio fre uency transformer comprising a U-shape core carrying a continuous coil extending about both legs and the bight portion thereof, and a core mounted Within one of the legs of said' core and carrying a coil connected in series With the rst-named coil.

4. In a radio frequency transformer, a core including spaced parallel portions carrying a coil on both. portions, a stationary core mounted Within one of said core portions and carrying a coii, and a coil rotatabi' mounted Within said second-named coil an connected .series therewith,

5. A radio :frequency transformer comprising a U-shaped core carrying a continuons coil extending about both .legs and the bight portion thereof, a stationary core mounted Within one of the lege of said U- shaped core and carrying a coil inductive relation to the tiret named coil, and .a third core rotatably mounted "Within said second stationary core and carrying coil connected in series with said second named coil.

In testimony whereof I ture.

described the invention, I

aix my signa- MRTIN G. SATEREN. 

